Improved support for custom configs in data tests (#5679)

## What are you changing in this pull request and why?

Update docs for generic data tests about new support for custom configs
in dbt Cloud

closes #5548 

## Checklist
- [x] Review the [Content style
guide](https://github.com/dbt-labs/docs.getdbt.com/blob/current/contributing/content-style-guide.md)
so my content adheres to these guidelines.
- [x] For [docs
versioning](https://github.com/dbt-labs/docs.getdbt.com/blob/current/contributing/single-sourcing-content.md#about-versioning),
review how to [version a whole
page](https://github.com/dbt-labs/docs.getdbt.com/blob/current/contributing/single-sourcing-content.md#adding-a-new-version)
and [version a block of
content](https://github.com/dbt-labs/docs.getdbt.com/blob/current/contributing/single-sourcing-content.md#versioning-blocks-of-content).
- [x] Needs review from PM
- [x] Needs review from product eng

---------

Co-authored-by: Leona B. Campbell <[email protected]>
Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: Grace Goheen <[email protected]>
Co-authored-by: Jeremy Cohen <[email protected]>

website/docs/docs/dbt-versions/release-notes.md

@@ -19,6 +19,9 @@ Release notes are grouped by month for both multi-tenant and virtual private clo
 [^*] The official release date for this new format of release notes is May 15th, 2024. Historical release notes for prior dates may not reflect all available features released earlier this year or their tenancy availability.
 
 ## July 2024
+- **Enhancement:** Custom configurations are now supported by generic data tests. Use this to configure how dbt should run the data test (for example, specifying a Snowflake virtual warehouse different from the one in your connection). To learn more, refer to [Specify custom configurations for generic data tests](/reference/data-test-configs#specify-custom-configurations-for-generic-data-tests).
+
+  Support for this configuration is available in dbt Cloud when selecting "Keep on latest version." Specifying custom configurations for data tests will become available in dbt Core later this year.
 
 - **Enhancement**: Introducing a revamped overview page for dbt Explorer, available in beta. It includes a new design and layout for the Explorer homepage. The new layout provides a more intuitive experience for users to navigate their dbt projects, as well as a new **Latest updates** section to view the latest changes or issues related to project resources. To learn more, refer to [Overview page](/docs/collaborate/explore-projects#overview-page).
 - **Enhancement**: The dbt Semantic Layer now offers more granular control by supporting multiple data platform credentials, which can represent different roles or service accounts. Available for dbt Cloud Enterprise plans, you can map credentials to service tokens for secure authentication. Refer to [Set up dbt Semantic Layer](/docs/use-dbt-semantic-layer/setup-sl#set-up-dbt-semantic-layer) for more details.

website/docs/reference/data-test-configs.md

@@ -275,3 +275,26 @@ tests:
 ```
 
 </File>
+
+#### Specify custom configurations for generic data tests
+
+_Currently available in dbt Cloud only. Specifying custom configurations for data tests will become available in dbt Core later this year._
+
+Use any custom config key to specify custom configurations for data tests. For example, the following specifies the `snowflake_warehouse` custom config that dbt should use when executing the `accepted_values` data test:
+
+```yml
+
+models:
+  - name: my_model
+    columns:
+      - name: color
+        tests:
+          - accepted_values:
+              values: ['blue', 'red']
+              config:
+                severity: warn
+                snowflake_warehouse: my_warehouse
+
+```
+
+Given the config, the data test runs on a different Snowflake virtual warehouse than the one in your default connection to enable better price-performance with a different warehouse size or more granular cost allocation and visibility.